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igor_vitrenko [27]
3 years ago
8

The nonmetals include which of the following groups? Use the periodic table to answer the question. Check all that apply. haloge

ns alkali metals lanthanides noble gases alkaline earth metals
Physics
1 answer:
scZoUnD [109]3 years ago
3 0

Answer:

Includes halogens and noble gases

Explanation:

of 118 elements that we know, only 25 elements are non metals. This elements aren't good conductors of electric and heat. And they are weak so you can't convert them into laminas or stretch them, Halogens and noble gases are part of the non metals group, and also you have elements that belong to this group like hydrogen, carbon, sulfur, selenium, nitrogen, oxyhem and phosporus

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A weightlifter lifts a 1250-N barbell 2 m in 3 s.How much power was used to lift the barbell?
Vlad [161]

The power is 833.3 W

Explanation:

First of all, we need to calculate the work done in lifting the barbell, which is equal to the change in gravitational potential energy of the barbell:

W=(mg)h

where

mg = 1250 N is the weight of the barbell

h = 2 m is the change in height

Substituting,

W=(1250)(2)=2500 J

Now we can calculate the power, which is equal to the work done per unit time:

P=\frac{W}{t}

where

W = 2500 J is the work done

t = 3 s is the time taken

Substituting,

P=\frac{2500}{3}=833.3 W

Learn more about power:

brainly.com/question/7956557

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5 0
2 years ago
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ludmilkaskok [199]

Answer:

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7 0
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What is the density of a roll of pennies containing 50 pennies?
ololo11 [35]

Answer:

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Density = Mass/Volume

Now, density is an intensive property, this means that if you have 10 grams of a given material or 1000 grams of the same material, in both cases you will find the same density.

Then a roll of 50 pennies has the same density that a single penny.

The measures of a single penny are:

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The coin is a cylinder, and the volume of a cylinder is:

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pi = 3.14

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h = thikness = 1.52mm

The volume is:

V = 3.14*(9.525mm)^2*1.52mm = 433.015 mm^3

The density will be:

D = 2.5g/433.015mm^3 = 0.00577 g/mm^3

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3 years ago
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